Product Data Sheet Safety Data Sheet Show all documents

Sika Retardol®-25

Set Retarding Concrete Admixture

A universal liquid concrete admixture for long and medium set retardation. Sika Retardol® -25 meets requirements for set retarding admixtures according to SIA Standard 162 (1989) and guideline A (1982) FSHBZ.
t complies with ASTM C494 type B and B.S. 5075 part I.

Controlled extension of setting times.
. Increased strengths.
. Reduced shrinkage and creep.
. Chloride free-does not attack reinforcement.
The specific advantages of Sika Retardol® -25 are especially visible in bridge construction and demanding industrial, high-rise and power generation build-up.
Product Data Sheet Safety Data Sheet Show all documents

Usage

Sika Retardol® -25 is used for quality concrete:

. Where a controlled extension of setting time is required.
. For large volume pours with simultaneous setting.
. To avoidance of cold joints.
. During long hauls.
. For difficult placing conditions.
. At elevated temperatures.
. Where concrete needs to be re-vibrated.
. If fast hardening after setting is an advantage and high final strengths are required.
. Mass concrete.

Advantages

Controlled extension of setting times.
. Increased strengths.
. Reduced shrinkage and creep.
. Chloride free-does not attack reinforcement.
The specific advantages of Sika Retardol® -25 are especially visible in bridge construction and demanding industrial, high-rise and power generation build-up.

Packaging

5 and 20 kg pails
220 kg drums
Bulk Tanks packing available upon request

Colour

Yellowish liquid

Product Details

Product Information

Composition

Modified Phosphates

Shelf life

12 months from date of production if stored properly in undamaged and unopened original sealed packing.

Storage conditions

Store in dry conditions, protected from direct sunlight and frost.

Density

(at 20°C) 1.100 ± 0.005 kg/l

Technical Information

Concreting Guidance

Concrete Placing Standard rules of good concrete production and placing practice must be observed when using Sika Retardol® -25.

Specific Advice

Formwork for retarded concrete must be tight and non-absorbent. Normal timber formwork is to undergo pre-wetting for a few days or must be treated with Separol® or Sika Form Oil® emulsion.

Curing Conditions

To prevent premature drying out, freshly placed concrete must be kept moist before and after setting. Either covered with plastic sheets or wet hessian or Antisol® -E as a curing compound.
When wet cure, ensure that not too much water is used.

Application

Application Information

Dispensing

Sika Retardol® -25 is dispensed simultaneously with the gauging water into the mixer or added mixed with the gauging water.
Automatic and accurate dispensing equipment is available from Sika.
Consumption

Recommended Dosage

0.3 – 3.0 % by weight of cement.
The retardation rate achieved is directly dependant on the dosage rate which influenced by: quality age of cement, aggregates, water: cement ratio, ambient
temperature, temperature of fresh concrete, cement dosage… etc.
It is advisable to carry out trial mixes to establish the exact dosage rate required.

Documents